feat(meezi_app): Meezi green theme + rich discovery API (Koja parity, code-only)

Head-start on the Koja-Flutter build while pub access is unavailable (pub.dev 403
under sanctions). NOT yet built/verified — needs `flutter create` + `pub get` once
package access is restored.

- core/theme/app_theme.dart: centralized MeeziTheme (brand green #0F6E56, Material 3,
  filled/outlined buttons, inputs), wired into main.dart (was a brown seed, no theme).
- public_api.dart: discover() gains the full filter set (themes/vibes/occasions/
  spaceFeatures/noise/priceTier/size/openNow) + discoverNearby/nlpParse/discoverTaxonomy,
  matching the web Koja's backend surface. Follows the existing dio pattern.

mobile/meezi_app/lib/features/public/public_api.dart

@@ -10,12 +10,28 @@ class PublicApi {
     String? q,
     double? minRating,
     String? sort,
+    List<String>? themes,
+    List<String>? vibes,
+    List<String>? occasions,
+    List<String>? spaceFeatures,
+    String? noise,
+    String? priceTier,
+    String? size,
+    bool openNow = false,
   }) async {
     final params = <String, String>{};
     if (city != null && city.isNotEmpty) params['city'] = city;
     if (q != null && q.isNotEmpty) params['q'] = q;
     if (minRating != null) params['minRating'] = minRating.toString();
     if (sort != null && sort.isNotEmpty) params['sort'] = sort;
+    if (themes != null && themes.isNotEmpty) params['themes'] = themes.join(',');
+    if (vibes != null && vibes.isNotEmpty) params['vibes'] = vibes.join(',');
+    if (occasions != null && occasions.isNotEmpty) params['occasions'] = occasions.join(',');
+    if (spaceFeatures != null && spaceFeatures.isNotEmpty) params['spaceFeatures'] = spaceFeatures.join(',');
+    if (noise != null && noise.isNotEmpty) params['noise'] = noise;
+    if (priceTier != null && priceTier.isNotEmpty) params['priceTier'] = priceTier;
+    if (size != null && size.isNotEmpty) params['size'] = size;
+    if (openNow) params['openNow'] = 'true';
     final res = await _client.dio.get<Map<String, dynamic>>(
       '/api/public/discover',
       queryParameters: params.isEmpty ? null : params,
@@ -24,6 +40,43 @@ class PublicApi {
     return list.cast<Map<String, dynamic>>();
   }
 
+  /// Cafés near a coordinate, sorted by distance (for "near me").
+  Future<List<Map<String, dynamic>>> discoverNearby({
+    required double lat,
+    required double lng,
+    String? excludeSlug,
+    int limit = 12,
+  }) async {
+    final res = await _client.dio.get<Map<String, dynamic>>(
+      '/api/public/discover/near',
+      queryParameters: {
+        'lat': lat,
+        'lng': lng,
+        if (excludeSlug != null && excludeSlug.isNotEmpty) 'excludeSlug': excludeSlug,
+        'limit': limit,
+      },
+    );
+    final list = res.data?['data'] as List<dynamic>? ?? [];
+    return list.cast<Map<String, dynamic>>();
+  }
+
+  /// Parse a free-text query into structured discovery hints (themes/vibes/...).
+  Future<Map<String, dynamic>?> nlpParse(String q) async {
+    final res = await _client.dio.get<Map<String, dynamic>>(
+      '/api/public/discover/nlp-parse',
+      queryParameters: {'q': q},
+    );
+    return res.data?['data'] as Map<String, dynamic>?;
+  }
+
+  /// The discovery taxonomy (available themes, vibes, occasions, space features).
+  Future<Map<String, dynamic>?> discoverTaxonomy() async {
+    final res = await _client.dio.get<Map<String, dynamic>>(
+      '/api/public/discover-profile/taxonomy',
+    );
+    return res.data?['data'] as Map<String, dynamic>?;
+  }
+
   Future<List<Map<String, dynamic>>> getReviews(String slug, {int page = 1}) async {
     final res = await _client.dio.get<Map<String, dynamic>>(
       '/api/public/cafes/$slug/reviews',